[20 ] 
weighing about two ounces ; this clay was intermixed 
with fmall (hoots of felenites, furrounded with the 
iine yellow ochry clay mentioned above. After cal- 
cination, part of the clay had vitrified, part was be- 
come of a dark red, and the felenites were burn 
to a white powder. 
„ Experiment XXIII. 
I threw fome of the white fediment, procured by 
filtration and evaporation mentioned in Experiment 17. 
on a red hot iron ; it partly bliftered up, and turned 
of a greyifii color, and the remainder, which was 
the greater quantity, appeared of a very clear white. 
Experiment XXIV. 
Having, by evaporation and filtration, procured 
fome felenites from the Somerfiiam water, I threw 
it into a red hot crucible, wherein it partly fwelled up 
like blifters, and when cold appeared of a greyifii 
white, intermixed with particles of iron. 
Thefe Experiments plainly demonflrate, Sir, that 
the following contents are to be found in the So- 
merlham water. Firft, by Exp. 1, 2, 6, 7, 8, ‘9, 
13, 14, 15, 18, 20, 21, 24, iron. Secondly, by 
Exp. 13, 16, difiolved pyrites. Thirdly, by Exp. 
1, 3,4, ic, 11, 12, 14, 16, 18, a vitriolic acid. 
Fourthly, by Exp. 22, 23, 24, a calcarious earth. 
Fifthly, by Exp. 15, an ochre» Sixthly, by Exp. 
15, 16, 2i, 22, 23, 24, felenites. Seventhly, by 
Exp. 17, a muriatic fait, which doth not cryllallizc. 
And, Eighthly, bv Exp. 18, 10, 21, 23, 24, allum. 
The 
